Tip: Instead of soldering I use splicing connectors with levers for testing stuff like this out. For example:

https://www.wago.com/de-en/c/installation-terminal-blocks-an...

Wago has great stuff.

Tiny QOL change without too much work, you could install something like teamviewer on the tablet, and now you're able to control your AC remotely from your PC, your phone, or anywhere!

The MyAir (or e-Zone) app can already be accessed remotely. You install the app on your phone and pair it with your system by connecting to the same LAN. After the initial pairing it can be used from everywhere.

Using which reverse service, though?

From memory it connects to Firebase, possibly using the Realtime Database to sync state.

Hey - As the owner of a similar system I have a question for you - do you use their phone app to control your system from your phone in/out of the house, and did it still work after this?

I use the home assistant plugin with it personally, but I have tried the apps and they still work fine both locally and remote.

Cool, that's all I needed to know, I'll be following in your footsteps at some point, thanks for taking the leap and doing all this :)

Now back to connecting an orange-pi zero to the petcube cam someone bought me for Christmas. I've found TTL pins on there and I want to know what's going on...